D. VOLTAGE CHECKS
NOTE: Resistance of the temperature probe is typically 5 megohm at room temperature, with resistance decreasing as temperature rises. A shorted temperature probe will cause a runaway condition, and an open probe will cause a continuous OFF condition.
1.Voltage between temperature controller terminals 2 & 3 will be 120V any time the power switch (item 66) is turned ON. Absence of 120V indicates power switch OFF or defective, or a wiring or connector problem.
2.Voltage between TP1 and TP2 will be 120V when the unit is calling for heat. Absence of 120V, when heating is required, indicates:
a.) Power switch defective or OFF; or,
b.) Temperature controller defective or open temperature probe; or, c.) Wiring or connector problem
3.Voltage between TP1 and TP2 will be 120V when the unit is calling for heat. Failure to heat when 120V is present indicates that the element being tested is defective.
4.Voltage between temperature controller terminals 1 & 3 will be 120V when the thermostat is calling for heat. Absence of 120V, when heating is required, indicates:
a.) Power switch defective or OFF; or, b.) Temperature controller defective, or
c.) Shorted temperature probe or probe wiring shorted (check between terminals 4 & 5); or, d.) Wiring or connector problem
5.TP3 and TP4 are found only on waffle bakers equipped with a
NOTE: Newer waffle bakers do not use a
6.Voltage between timer terminals 2 & 3 is 120V any time the power switch is ON. Absence of 120V indicates:
a.) power switch defective or OFF; or, b.) a wiring or connector problem
7.Voltage between timer terminals 5 & 6 is 0V when the microswitch (item 10) is activated. Any voltage other than 0V indicates a defective microswitch, or a wiring or connector problem.
8.Voltage between timer terminals 1 & 2 is 120V during the cook cycle. Absence of 120V indicates a defective timer module.
9.An indicator light NOT lit when reading a voltage between timer terminals 1 & 2 is 120V indicates: a.) loose or defective wiring to the indicator light; or,
b.) defective indicator light
10.Voltage between timer terminals 2 & 4 is momentarily 120V at the end of the cook cycle. Absence of 120V indicates a defective timer module.
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